Why does a STA fail to associate with an AP when WEP and TKIP encryption is configured in 802.11n mode

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The 802.11n does not define the WEP or TKIP encryption mode. When the two encryption modes are used, STAs may fail to associate with the AP.

Other related questions:
Why cannot a STA associate with an AP when the radio type is set to pure 802.11n and the encryption mode is set to TKIP
TKIP is insecure, so 802.11n does not support TKIP encryption.

When the radio type of the AR router is set to pure 80211.11n and the encryption mode is set to TKIP, why does the wireless device fail to connect to the AP
TKIP is insecure, so 802.11n does not support TKIP encryption. When the radio type is set to pure 802.11n, the following encryption modes are supported: -open -wpa-psk ccmp -wpa2-psk ccmp -wapi -wpa dot1x ccmp -wpa2 dot1x ccmp

When the radio type of the AR router is set to pure 802.11n and the encryption mode is set to WEP, why does the wireless device fail to connect to the AP
WEP is insecure, so 802.11n does not support WEP encryption. When the radio type is set to pure 802.11n, the following encryption modes are supported: -open -wpa-psk ccmp -wpa2-psk ccmp -wapi -wpa dot1x ccmp -wpa2 dot1x ccmp

Why cannot STAs associate with an AP when WEP authentication is used
The possible causes are as follows: - No WEP SSID is added to the STA. Many STAs associate with WEP SSIDs by using encryption without authentication. However, the AP uses both authentication and encryption. Therefore, the STA cannot associate with the SSID. The SSID must be manually configured on the STA. At last, set the encryption type to share mode. - The key index configured on the AP is different from the key index on the STA. By default, the key index of an AP is 0 (ranging from 0 to 3), and the key index of STA is 1 (ranging from 1 to 4). Key index 0 on the AP matches key index 1 on the STA.

Why did STAs fail to search 802.11n signals after the AP is enabled with 802.11n
This is because the IEEE 802.11n draft protocol does not support a high throughput rate of the WEP or TKIP unicast ciphers. If a STA uses the WEP or WPA-TKIP encryption mode, the data transmission rate will decrease to 54 Mbit/s. In WEP or TKIP mode, if the STA uses the 802.11b/g/n NIC to associate with APs, it can only be associated with 802.11g APs. As a result, the displayed signal transmission rate is 54 Mbit/s but not the 802.11n rate. This is restricted by the IEEE 802.11 standard.

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